Insulating bushing



Sept. 9, 1947. w. J. BILODEAU 2,427,134

INSULATING BUSHING Filed Sept. 11, 1945 Figl.

In vehtori Wilfred J.B'ilodeau,

His Attorney.

Patented Sept. 9, 1947 INSULATING BUSHING Wilfred. JuBilodeau; Windsor,Mass., assignor to General- Electric Company, a corporation of New YorkApplication September 11, 1945, Serial No. 615.670

3 Claims. 1

This invention relatesto electrical apparatus and more. particularly to;improvementsin high voltage electrical apparatus.

The terminal equipment .for high voltage electrical apparatusmust bespaced sufficiently from the normally grounded parts of the apparatus,such' as its enclosing. metal casing, that arcs or fiash-oversacrosssaid distance are prevented. However, this spacing materially increasesthe over-all dimensions of the apparatus so that it sometimes will notpass through clearance distances on highways or railways duringtransportation or shipment of'the apparatus.

In accordance with this invention there is provided a novel-and simplearrangement for extending the high voltage terminal equipment forelectrical apparatus when the apparatus is in operation and forretracting it when the apparatus is de-energized for transportation orshipment. The invention is characterized by mounting the terminalequipment or element on the end of an angle member, the other end ofwhich is rotatably mounted on the. apparatus, the axis of rotation beinginclined to. the apparatus.

An object of the invention is to provide a new and improved electricalapparatus.

Another" object. of the invention is to provide new and improvedretractable high voltage terminal equipment for electrical apparatus.

A further object of the invention is to provide a novel high voltagebushing construction for electrical apparatus.

The invention will be better understood from the following descriptiontaken in connection with the accompanying drawing and its scope will bepointed out in the appended claims.

In the drawing Fig. 1 is a perspective view of a portable transformerprovided with preferred embodiments of the invention, Fig. 2 is anenlarged side elevation, partly in section, of one of the units of myinvention in its extended position, and Fig. 3 is a view similar to Fig.2 with the apparatus in its retracted position.

Referring now to the drawing and more particularly to Fig. 1, there isshown therein a portable transformer having a pair of high voltagebushings 2 and 3. The bushing 2 is shown in its extended or normallyoperative position and the bushing 3 is shown in its retracted position,to which position it is moved when the transformer is to be moved. Inaddition, the transformer is shown as being provided with a low voltagebushing 4 and a similar low voltage bushing which is not visible isbeneath a slidable cover 5. A similar cover 5 is associated with thebushing 4 and,

likewise, generally. similar but proportionately larger covers 6- areassociated with the high voltagebushings 2 and 3'. It will beunderstood. that when the transformer is in operation all of thebushings are in their extended positions, as shown by the bushings 2and- 4, whereas when the unit is de-energiaed all of the bushings willnormally be in their retracted positions corresponding to the positionof bushing 3 and all of them will be covered by their covers which areslid in place like the cover 5.. On. the outer end of eachbushing is aterminal I.

The structural features of the bushing 2 are shownin Fig. 2 and it willbe seen that the bushing consists of a central or intermediate member 8,extending from opposite ends of which are conventional petticoatedceramic insulating members 9 and Ill. The parts 8 and 10 are shown inaxial alignment and the axis of the part 9 is shown inclined to the axisof the parts 8 and H1 at a suitable angle.

The bushing is passed through an openingin a part II of the casing 12 ofthe transformer. A hollow cylindrical member [3 is attached to the rimof the opening in the part H, such as by welding which is indicated at[4. The axis of the hollow cylindrical member I3 is also-shown inclinedat an angle to the perpendicular to the part I I.

For holding the bushing in any desired position the member I3 isprovided with a flange [5 and the intermediate part 8 of the bushing isprovided with a flange l5 and these parts are provided with a pluralityof registering holes through which locking bolts l1 may be passed. Inaddition, suitable gasketing material may be employed between theflanges for sealing the casing of the apparatus.

Fig. 3 shows the details of the duplicate high voltage bushing 3 in itsretracted position. In order to put the bushing 2 in the position inwhich the bushing 3 is shown, or vice versa, the bolts I! are removedand the bushing is rotated half a turn more or less in the sleeve orcylindrical member I3. This causes the outer part 9 to go from aposition perpendicular to the part i! to a position parallel to the partII, or vice versa. After the bushing has been lowered to the positionshown in Fig. 3 the bolts I! are reinserted and the cover 6 slid intoplace, as shown in Fig. 3, thus protecting the bushing from dirt, dustand breakage and providing an attractive streamlined appearance.

The inner end of the part It (not shown) is of course provided withanother electrical ter- 3 minal for making electrical connection to theapparatus inside the casing in any well known manner, such as by meansof a cable which will flex sufiiciently to permit rotation of thebushing through half a turn more or less about the axis of the sleevel3.

While there have been shown and described particular embodiments of thisinvention, it will be obvious to those skilled in the art that variouschanges and modifications can be made therein without departing from theinvention and, therefore, it is aimed in the appended claims to coverall such changes and modifications as fall within the true spirit andscope of the invention.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is:

1. In combination, an enclosing casing for electrical apparatus, anopening in a part of said casing, a hollow cylindrical member passingthrough said opening, means for fastening said member to said casingwith the axis of said member at a suitable angle with the perpendicularto said part of said casing, and an insulating bushing having two endmembers separated by a cylindrical intermediate member, saidintermediate member and one end member being coaxially aligned, theother end member having an axis inclined at a suitable angle with theaxis of said intermediate member, said intermediate member being mountedfor rotation in said hollow cylindrical member with the aligned endmember in said casing and the inclined end member outside said casingwhereby rotation of said intermediate member about its axis through halfa turn more or less will vary the inclination of said outer memberrelative to said part of the casing from approximately parallel theretoto perpendicular thereto.

2. In combination, an enclosing casing for electrical apparatus mountedon wheels for highway transportation, a depression in the top of saidcasing, a circular opening in the top of said casing at one end of saiddepression, said opening having an axis inclined to the vertical, and ahigh voltage insulating bushing having a central cylindrical portionmounted for axial rotation in said opening, said bushing having aninsulating portion which extends into said casing and which is coaxialwith the central por tion of said bushing, said bushing having anotherinsulating portion which extends outside of said casing and which isinclined at an angle to the axis of said central portion whereby axialrotation of said central portion through one-half turn moves the portionof said bushing which extends outside of said casing between a verticalposition and a horizontal position in said depression.

3. In combination, an enclosed casing for electrical apparatus mountedon wheels for high way transportation, a depression in the top of saidcasing, a circular opening in the top of said casing at one end of saiddepression, said opening having an axis inclined substantially 45 to thevertical, a high voltage insulating bushing having a central cylindricalportion mounted for axial rotation in said opening, said bushing havingan insulating portion extending into said casing which is coaxial withits central portion, said bushing having an insulating portion extendingoutside of said casing and inclined at an angle of substantially 45 tothe axis of said central portion whereby axial rotation of said centralportion through one-half turn moves the insulating portion of saidbushing which is outside of said casing between a vertical position anda horizontal position in said depression, and a movable cover for saiddepression.

WILFRED J. BILODEAU.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,284,782 Watson June 2, 19421,777,073 Burnham Sept. 30, 1930 979,840 Goddard Dec. 27, 1910 FOREIGNPATENTS Number Country Date 348,965 Germany Feb. 21, 1922 358,354 GreatBritain Oct. 8, 1931

